The option to input the new rate in the bill for the memorized transactions is unavailable, @ELM. As a workaround, you'll have to manually update the rate for each bill to ensure that the rates are accurate and reflect any changes that may have occurred.
In the meantime, we encourage you to submit your requests to our product engineers through the feedback system. Your input is crucial in shaping the future features of our product. Here’s how to do it:
- Go to the Help menu.
- Select Send Feedback Online.
- Click Product Suggestion.

Once the customer pays their invoices, you can proceed to record their payments. Check out this article for further guidelines: Record an invoice payment.
Please know that your input is valuable, and I'll strive to provide the necessary details to help rectify your QuickBooks-related concerns. feel free to use the comment section so I can interact again. Keep safe, and have a good one.